Dewaraja, Lorna Srimanthie
Lake House Investments, 1972
Buku Teks
Paranavitana, Senarat, author
Lake House Investments, 1972
Buku Teks
Amerasinghe, Anthony Ranjit Bevis, author
Lake House Investments, 1971
Buku Teks
Kearney, Robert N.
Cornell University Press, 1973
Buku Teks
Tresidder, Argus John
D. Van Nostrand Comp., 1960
Buku Teks